CVE-2023-35945

HIGH EPSS 61.7%
Published Jul 13, 20232y ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Jul 13, 2023 2y ago
Last Modified Jun 17, 2026 1w ago

Description

Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the `GOAWAY` frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to `GOAWAY` frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
61.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-400 Uncontrolled Resource Consumption Resource Mgmt
CWE-459

Affected Products 5

VendorProductVersionRange
envoyproxyenvoy* <1.23.11
envoyproxyenvoy*≥1.24.0  –  <1.24.9
envoyproxyenvoy*≥1.25.0  –  <1.25.8
envoyproxyenvoy*≥1.26.0  –  <1.26.3
nghttp2nghttp2* <1.55.1

References 2

  • github.com https://github.com/envoyproxy/envoy/security/advisories/GHSA-jfxv-29pc-x22r
    Vendor Advisory
  • github.com https://github.com/nghttp2/nghttp2/blob/e7f59406556c80904b81b593d38508591bb7523a/lib/nghttp2_session.c#L3346
    Product

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.